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A search for doubly charged Higgs bosons with pairs of prompt, isolated, highly energetic leptons with the same electric charge is presented. The search uses a proton–proton collision data sample at a centre-of-mass energy of 13 TeV corresponding to 36.1 $$\text {fb}^{-1}$$ fb-1 of integrated luminosity recorded in 2015 and 2016 by the ATLAS detector at the LHC. This analysis focuses on the decays...

The differential cross-section for the production of a W boson in association with a top quark is measured for several particle-level observables. The measurements are performed using $${36.1}\,\text {fb}^{-1}$$ 36.1fb-1 of pp collision data collected with the ATLAS detector at the LHC in 2015 and 2016. Differential cross-sections are measured in a fiducial phase space defined by the presence of...

The modification of the production of $$J/\psi $$ J/ψ , $$\psi (2\mathrm {S})$$ ψ(2S) , and $$\varUpsilon (n\mathrm {S})$$ Υ(nS) ($$n = 1, 2, 3$$ n=1,2,3 ) in p+Pb collisions with respect to their production in pp collisions has been studied. The p+Pb and pp datasets used in this paper correspond to integrated luminosities of $$28~\mathrm {nb}^{-1}$$ 28nb-1 and $$25~\mathrm {pb}^{-1}$$ 25pb-1 respectively,...

This paper presents a measurement of the polarisation of $$\tau $$ τ leptons produced in $$Z/\gamma ^{*}\rightarrow \tau \tau $$ Z/γ∗→ττ decays which is performed with a dataset of proton—proton collisions at $$\sqrt{s}=8$$ s=8 TeV, corresponding to an integrated luminosity of 20.2 fb$$^{-1}$$ -1 recorded with the ATLAS detector at the LHC in 2012. The $$Z/\gamma ^{*}\rightarrow \tau \tau $$ Z/γ∗→ττ...

A search for the direct production of charginos and neutralinos in final states with at least two hadronically decaying tau leptons is presented. The analysis uses a dataset of pp collisions corresponding to an integrated luminosity of 36.1 fb$$^{-1}$$ -1 , recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. No significant deviation from the expected...

Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range $$|\eta |<2.4$$ |η|<2.4 using 7 and 470 $$\upmu \hbox {b}^{-1}$$ μb-1 of Pb+Pb collisions at $$\sqrt{s_{\text {NN}}}=2.76$$ sNN=2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients $$v_n$$...

This paper presents a direct measurement of the decay width of the top quark using $$t\bar{t}$$ tt¯ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 8 TeV and corresponds to an integrated luminosity of 20.2 fb$$^{-1}$$ -1 . The decay width of the top quark is measured using a template fit...

A measurement of the mass of the W boson is presented based on proton–proton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector at the LHC, and corresponding to $$4.6~\hbox {fb}^{-1}$$ 4.6fb-1 of integrated luminosity. The selected data sample consists of $$7.8\times 10^6$$ 7.8×106 candidates in the $$W\rightarrow \mu \nu $$ W→μν channel and $$5.9\times...

A search is performed for new phenomena in events having a photon with high transverse momentum and a jet collected in $$36.7~\text {fb}^{-1} $$ 36.7fb-1 of proton–proton collisions at a centre-of-mass energy of $$\sqrt{s}$$ s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The invariant mass distribution of the leading photon and jet is examined to look for the resonant...

A search for neutral heavy resonances is performed in the $$WW\rightarrow e\nu \mu \nu $$ WW→eνμν decay channel using pp collision data corresponding to an integrated luminosity of $$36.1\,\hbox {fb}^{-1}$$ 36.1fb-1 , collected at a centre-of-mass energy of 13$$\,\text {TeV}$$ TeV by the ATLAS detector at the Large Hadron Collider. No evidence of such heavy resonances is found. In the search for...

A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses $$36.1 \; \mathrm {fb}^{-1}$$ 36.1fb-1 of proton–proton collision data recorded by the ATLAS experiment at $$\sqrt{s}=13$$ s=13 TeV in 2015 and 2016. No significant...

The results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using $$36.1~\hbox {fb}^{-1}$$ 36.1 fb - 1 of integrated luminosity from proton–proton collisions at $$\sqrt{s}=13$$ s = 13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences...

Measurements of transverse energy–energy correlations and their associated asymmetries in multi-jet events using the ATLAS detector at the LHC are presented. The data used correspond to $$\sqrt{s} = 8~\hbox {TeV}$$ s = 8 TeV proton–proton collisions with an integrated luminosity of 20.2 $$~\hbox {fb}^{-1}$$ fb - 1 . The results are presented in bins of the scalar sum...

This paper presents single lepton and dilepton kinematic distributions measured in dileptonic $$t\bar{t}$$ t t ¯ events produced in 20.2 $$\hbox {fb}^{-1}$$ fb - 1 of $$\sqrt{s}=8$$ s = 8 TeV pp collisions recorded by the ATLAS experiment at the LHC. Both absolute and normalised differential cross-sections are measured, using events with an opposite-charge...

Observables sensitive to the anomalous production of events containing hadronic jets and missing momentum in the plane transverse to the proton beams at the Large Hadron Collider are presented. The observables are defined as a ratio of cross sections, for events containing jets and large missing transverse momentum to events containing jets and a pair of charged leptons from the decay of a $$Z/\gamma...

With the increase in energy of the Large Hadron Collider to a centre-of-mass energy of 13 $$\text {TeV}$$ TeV for Run 2, events with dense environments, such as in the cores of high-energy jets, became a focus for new physics searches as well as measurements of the Standard Model. These environments are characterized by charged-particle separations of the order of the tracking detectors sensor...

This paper presents a study of $$WW\gamma $$ W W γ and $$WZ\gamma $$ W Z γ triboson production using events from proton–proton collisions at a centre-of-mass energy of $$\sqrt{s} = \text{8}\,\text{TeV}$$ s = 8 TeV recorded with the ATLAS detector at the LHC and corresponding to an integrated luminosity of 20.2 fb $$^{-1}$$ - 1 . The $$WW\gamma $$...

The rejection of forward jets originating from additional proton–proton interactions (pile-up) is crucial for a variety of physics analyses at the LHC, including Standard Model measurements and searches for physics beyond the Standard Model. The identification of such jets is challenging due to the lack of track and vertex information in the pseudorapidity range $$|\eta |>2.5$$ | η | >...

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